hoover dam on colorado river on the nevada arizona border, southwest desert

america american arch arizona attraction border bridge bypass canyon cliffs colorado connecting dam deal depression desert electric electricity generation great high historic hoover hydro hydroelectric intake lake lines mead memorial mike nevada north ocallaghan outdoor outdoors pat powell power project reservoir river road rocks rocky sandstone southwest southwestern state states technology tillman tourist towers travel united usa view water west western drought conditions o`callaghanpat o`callaghan usa